The use of rational emotive behavior therapy (REBT) in sport psychology has received scant research attention. Therefore, little is known about how REBT can be adopted by sport psychology practitioners. This paper principally outlines how practitioners can use REBT on a one-to-one basis to reduce irrational beliefs in athletes. Guidance is offered on the introduction of REBT to applied contexts, the REBT process through which an athlete is guided, and offers an assessment of the effectiveness of REBT with athletes. It is hoped that this paper will encourage other practitioners to adopt REBT in their work and to report their experiences.